Hello, 
I have a problem with a deployable package in my development DEVBOX (VM). I can see the "grayed model" (It's our custom model reference) in the AOT in version 8.0 PU23 that refers to an imported model. I can then create an extension of an object belonging to this package.
However, in version 8.1.3 PU23, I don't see anymore the "grayed model" in the AOT. 
Is this a version bug?
I performed a manual installation of the DeployableRuntime package but without success.
Do you have any idea about this ?
Kind regards,
Stelvio.